Add a directory-specific nameserver data to templates

If a template is being rendered into a directory that represents a
nameserver (e.g. "ns1"), include a nameserver-specific information in
the data - variable called "ns" which has information about the
nameserver this file belongs to.

Ensure the "ns" variable is only exposed to the template when rendered,
without affecting the environment variables (always work with a copy of
the env_vars).

(cherry picked from commit aa435b2e036a668d87579495cae1e31524a97f31)

diff --git a/bin/tests/system/isctest/template.py b/bin/tests/system/isctest/template.py
index f26c7deab9ff8995b65bdd8e6c428fb72ac06c95..b90054e4a5f062b7fe299c740d0a1393e324a1ff 100644 (file)
--- a/bin/tests/system/isctest/template.py
+++ b/bin/tests/system/isctest/template.py
@@ -15,12 +15,15 @@ from dataclasses import dataclass
 import os
 from pathlib import Path
 import re
+from re import compile as Re
 from typing import Any, Dict, Optional, Union
 
 import pytest
 
 from .log import debug
 
+NS_DIR_RE = Re(r"^(a?ns([0-9]+))/")
+
 
 class TemplateEngine:
     """
@@ -81,10 +84,16 @@ class TemplateEngine:
             raise RuntimeError('No jinja2 template found for "{output}"')
 
         if data is None:
-            data = self.env_vars
+            data = {**self.env_vars}
         else:
             data = {**self.env_vars, **data}
 
+        # directory-specific "ns" var
+        assert "ns" not in data, '"ns" variable is reserved for nameserver data'
+        match = NS_DIR_RE.search(output)
+        if match:
+            data["ns"] = Nameserver(match.group(1))
+
         debug("rendering template `%s` to file `%s`", template, output)
         stream = self.j2env.get_template(template).stream(data)
         stream.dump(output, encoding="utf-8")